//
//  ViewController.swift
//  video-edit
//
//  Created by ryosuke-hujisawa on 2017/10/04.
//  Copyright © 2017年 ryosuke-hujisawa. All rights reserved.
//

import UIKit
import AVFoundation
import AVKit

class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {

    let imagePickerController = UIImagePickerController()
    var videoURL: URL?

    @IBAction func ChoiceCamera(_ sender: Any) {

        print("UIBarButtonItem。カメラロールから動画を選択")
        imagePickerController.sourceType = .photoLibrary
        imagePickerController.delegate = self
        imagePickerController.mediaTypes = ["public.image", "public.movie"]
        present(imagePickerController, animated: true, completion: nil)
    }





    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
        //アルバムから選択した動画を変数に代入
        let documentsPath = info[UIImagePickerControllerMediaURL] as! URL!
        videoURL =  documentsPath

        //viewを戻す
        picker.dismiss(animated: true, completion: nil)
    }






    @IBAction func SaveMovies(_ sender: Any) {

        // 動画のurlを定義する
        // Define the url of the video
        let url = videoURL
        //URL(string: "https://160.16.120.119/kkk.m4v")

        // 動画URLからアセットを生成
        // Generate assets from video URL
        let videoAsset: AVURLAsset = AVURLAsset(url: url!)

        // アセットからトラックを取得
        // Get a track from an asset
        let videoTrack: AVAssetTrack = videoAsset.tracks(withMediaType: AVMediaType.video)[0]
        let audioTrack: AVAssetTrack = videoAsset.tracks(withMediaType: AVMediaType.audio)[0]

        // ベースとなる動画のコンポジション作成
        // Composition creation of the base video
        let mainComposition : AVMutableComposition = AVMutableComposition()

        // コンポジションのトラック作成
        // Creating composition tracks
        let compositionVideoTrack: AVMutableCompositionTrack = mainComposition.addMutableTrack(withMediaType: AVMediaType.video, preferredTrackID: kCMPersistentTrackID_Invalid)!

        let compositionAudioTrack: AVMutableCompositionTrack = mainComposition.addMutableTrack(withMediaType: AVMediaType.audio, preferredTrackID: kCMPersistentTrackID_Invalid)!

        // コンポジションの設定
        // Composition setting
        try! compositionVideoTrack.insertTimeRange(CMTimeRangeMake(kCMTimeZero, videoAsset.duration), of: videoTrack, at: kCMTimeZero)
        try! compositionAudioTrack.insertTimeRange(CMTimeRangeMake(kCMTimeZero, videoAsset.duration), of: audioTrack, at: kCMTimeZero)















        // ロゴのCALayerの作成
        // Create logo CALayer
        //let logoImage : UIImage = UIImage(named: "logo")!
        // UIImage インスタンスの生成
        // 画像はAssetsに入れてないのとjpgなので拡張子を入れます
        let image1:UIImage = UIImage(named:"logo.png")!

        // UIImageView 初期化
        let logoImage = UIImageView(image:image1)




        let logoLayer: CALayer = CALayer()
        logoLayer.contents = logoImage
        logoLayer.frame = CGRect(x: 5, y: 25, width: 57, height: 57)
        logoLayer.opacity = 0.9

        // 動画のサイズを取得
        // Get video size
        let videoSize: CGSize = videoTrack.naturalSize


        // 親レイヤーを作成
        // Create parent layer
        let parentLayer: CALayer = CALayer()
        let videoLayer: CALayer = CALayer()
        parentLayer.frame = CGRect(x: 0, y: 0, width: videoSize.width, height: videoSize.height)
        videoLayer.frame = CGRect(x: 0, y: 0, width: videoSize.width, height: videoSize.height)
        parentLayer.addSublayer(videoLayer)
        parentLayer.addSublayer(logoLayer)

        // 合成用コンポジション作成
        // Composition composition creation
        let videoComp = AVMutableVideoComposition()
        videoComp.renderSize = videoSize
        videoComp.frameDuration = CMTimeMake(1, 30)
        videoComp.animationTool = AVVideoCompositionCoreAnimationTool.init(postProcessingAsVideoLayer: videoLayer, in: parentLayer)

        // インストラクション作成
        // Instruction creation
        let instruction: AVMutableVideoCompositionInstruction = AVMutableVideoCompositionInstruction()
        instruction.timeRange = CMTimeRangeMake(kCMTimeZero, mainComposition.duration)
        let layerInstruction: AVMutableVideoCompositionLayerInstruction = AVMutableVideoCompositionLayerInstruction.init(assetTrack: videoTrack)
        instruction.layerInstructions = [layerInstruction]

        // インストラクションを合成用コンポジションに設定
        // Set Instruction to Composition for Composition
        videoComp.instructions = [instruction]















        // 動画のコンポジションをベースにAVAssetExportを生成
        // Generate AVAssetExport based on composition of video
        let assetExport = AVAssetExportSession.init(asset: mainComposition, presetName: AVAssetExportPresetMediumQuality)

        /*



         下記が画像を動画に合成する処理。下記を記述する動画が生成されなくなる。
         下記の処理を消すと、正常にmacのドキュメントフォルダに動画が生成される


         Process below to combine images into moving images. A moving image describing the following will not be generated.
         When the following processing is deleted, a movie is normally generated in the mac document folder



         */
        // 合成用コンポジションを設定
        // Set composition for composition
        assetExport!.videoComposition = videoComp

        // 生成された動画を保存する場所のurlとファイルの名前を設定（今回はmacの中のDocumentsディレクトリに保存）
        // Set the url and file name where the generated video will be saved (this time saved in the Documents directory in mac)
        let documentsDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0] as URL

        //生成する動画の名前
        // Name of video to generate
        let filePath = documentsDirectory.appendingPathComponent("rendered-audio.m4v")

        // エクスポートファイルのビデオタイプの設定
        // Setting the video type of the export file
        assetExport?.outputFileType = AVFileType.mov

        // 出力されるurlの設定
        // Setting output url
        assetExport?.outputURL = filePath

        // これは必要？
        // Is this necessary?

        //assetExport?.shouldOptimizeForNetworkUse = true

        assetExport?.exportAsynchronously {

            //出力されたファイルのパスをprint表示
            //Print the path of the outputted file

            print("finished: \(filePath) :  \(String(describing: assetExport?.status.rawValue)) ")
        }
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        print("Hello World")
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
}